21220120020012 has 24 divisors (see below), whose sum is σ = 49514263780800. Its totient is φ = 7073280425616.

The previous prime is 21220120019977. The next prime is 21220120020013. The reversal of 21220120020012 is 21002002102212.

It is a junction number, because it is equal to n+sod(n) for n = 21220120019973 and 21220120020000.

It is not an unprimeable number, because it can be changed into a prime (21220120020013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10659562 + ... + 12492657.

It is an arithmetic number, because the mean of its divisors is an integer number (2063094324200).

Almost surely, 2^{21220120020012} is an apocalyptic number.

It is an amenable number.

21220120020012 is an abundant number, since it is smaller than the sum of its proper divisors (28294143760788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21220120020012 is a wasteful number, since it uses less digits than its factorization.

21220120020012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23228605 (or 23228603 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21220120020012 its reverse (21002002102212), we get a palindrome (42222122122224).

The spelling of 21220120020012 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty million, twenty thousand, twelve".